/*
 * Copyright 2008 The Apache Software Foundation Licensed under the Apache
 * License, Version 2.0 (the "License"); you may not use this file except in
 * compliance with the License. You may obtain a copy of the License at
 * http://www.apache.org/licenses/LICENSE-2.0 Unless required by applicable law
 * or agreed to in writing, software distributed under the License is
 * distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied. See the License for the specific language
 * governing permissions and limitations under the License.
 */

package org.apache.ibatis.ibator.generator.ibatis2.sqlmap.elements;

import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;

import org.apache.ibatis.ibator.api.IntrospectedColumn;
import org.apache.ibatis.ibator.api.dom.OutputUtilities;
import org.apache.ibatis.ibator.api.dom.java.FullyQualifiedJavaType;
import org.apache.ibatis.ibator.api.dom.xml.Attribute;
import org.apache.ibatis.ibator.api.dom.xml.TextElement;
import org.apache.ibatis.ibator.api.dom.xml.XmlElement;
import org.apache.ibatis.ibator.config.GeneratedKey;
import org.apache.ibatis.ibator.generator.ibatis2.Ibatis2FormattingUtilities;

/**
 * @author Jeff Butler
 */
public class InsertElementGenerator extends AbstractXmlElementGenerator
{

	public InsertElementGenerator()
	{
		super();
	}

	@Override
	public void addElements(XmlElement parentElement)
	{
		XmlElement answer = new XmlElement("insert"); //$NON-NLS-1$
		answer.addElement(new TextElement("<![CDATA["));
		answer.addAttribute(new Attribute(
				"id", introspectedTable.getIbatis2SqlMapNamespace() + "." + introspectedTable.getInsertStatementId())); //$NON-NLS-1$

		FullyQualifiedJavaType parameterType = introspectedTable.getRules()
				.calculateAllFieldsClass();

		answer.addAttribute(new Attribute("parameterClass", //$NON-NLS-1$
				parameterType.getFullyQualifiedName()));

		ibatorContext.getCommentGenerator().addComment(answer);

		GeneratedKey gk = introspectedTable.getGeneratedKey();

		if (gk != null && gk.isBeforeInsert())
		{
			IntrospectedColumn introspectedColumn = introspectedTable
					.getColumn(gk.getColumn());
			// if the column is null, then it's a configuration error. The
			// warning has already been reported
			if (introspectedColumn != null)
			{
				// pre-generated key
				answer.addElement(getSelectKey(introspectedColumn, gk));
			}
		}

		StringBuilder insertClause = new StringBuilder();
		StringBuilder valuesClause = new StringBuilder();

		insertClause.append("insert into "); //$NON-NLS-1$
		insertClause.append(introspectedTable
				.getFullyQualifiedTableNameAtRuntime());
		insertClause.append(" ("); //$NON-NLS-1$

		valuesClause.append("values ("); //$NON-NLS-1$

		List<String> valuesClauses = new ArrayList<String>();
		Iterator<IntrospectedColumn> iter = introspectedTable.getAllColumns()
				.iterator();
		while (iter.hasNext())
		{
			IntrospectedColumn introspectedColumn = iter.next();
			if (introspectedColumn.isIdentity())
			{
				// cannot set values on identity fields
				continue;
			}

			insertClause.append(Ibatis2FormattingUtilities
					.getEscapedColumnName(introspectedColumn));
			valuesClause.append(Ibatis2FormattingUtilities
					.getParameterClause(introspectedColumn));
			if (iter.hasNext())
			{
				insertClause.append(", "); //$NON-NLS-1$
				valuesClause.append(", "); //$NON-NLS-1$
			}

			if (valuesClause.length() > 80)
			{
				answer.addElement(new TextElement(insertClause.toString()));
				insertClause.setLength(0);
				OutputUtilities.xmlIndent(insertClause, 1);

				valuesClauses.add(valuesClause.toString());
				valuesClause.setLength(0);
				OutputUtilities.xmlIndent(valuesClause, 1);
			}
		}

		insertClause.append(')');
		answer.addElement(new TextElement(insertClause.toString()));

		valuesClause.append(')');
		valuesClauses.add(valuesClause.toString());

		for (String clause : valuesClauses)
		{
			answer.addElement(new TextElement(clause));
		}

		if (gk != null && !gk.isBeforeInsert())
		{
			IntrospectedColumn introspectedColumn = introspectedTable
					.getColumn(gk.getColumn());
			// if the column is null, then it's a configuration error. The
			// warning has already been reported
			if (introspectedColumn != null)
			{
				// pre-generated key
				answer.addElement(getSelectKey(introspectedColumn, gk));
			}
		}
		answer.addElement(new TextElement("]]>"));
		if (ibatorContext.getPlugins().sqlMapInsertElementGenerated(answer,
				introspectedTable))
		{
			parentElement.addElement(answer);
		}
	}
}
